|  | 5.1 | The Network Layer Basics
| 5.1.1 | Explain path determination
As you have learned, the network layer interfaces two networks and provides best effort end-to-end packet delivery services to its user, the transport layer. The network layer sends packets from the source network to the destination network. To send packets from the source to the destination, path determination needs to occur at the network layer. This function is usually the responsibility of the router.
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